Asked by: Nuala Foitinho
asked in category: General Last Updated: 26th June, 2020

Will mold grow on plaster walls?

Mold does not grow on plaster because plaster is non-porous and lime-based or clay. Although plaster does not support microbial growth, if porous cellulose-based material such as drywall is used on the backside of the plaster for support, mold can grow on the drywall.

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Correspondingly, are plaster walls mold resistant?

We rarely see mold problems in older houses with plaster walls because plaster is not made of cellulose and does not provide food for the mold. Many people, including most contractors, assume that since green board is a “water proof” (actually, only somewhat water resistant) form of drywall, that mold won't eat it.

One may also ask, does lath and plaster mold? Some of these materials are more susceptible to mold growth when a moisture intrusion source is present. An example is the former use of lath and plaster walls compared to the current, less expensive use of drywall. Drywall contains a paper backing and lath and plaster does not.

Secondly, how do you treat mold on plaster walls?

Mix a solution of one part bleach to three parts water in a spray bottle, and thoroughly saturate the moldy areas of the wall. Open a window and/or keep a fan running as you work; bleach fumes are unpleasant and can be irritating to the lungs.

What causes mold on interior walls?

The most common causes of mold growing on walls are high humidity, condensation and water leaks (which are often hidden inside the wall). Condensation forms when water vapor in the air meets cold surfaces and cools to become liquid.

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